現今行動裝置如筆記型電腦，朝窄邊框與金屬機殼等趨勢設計，使得天線所能使用的空間大幅縮減，增加設計的難度。本論文第一部分為應用於筆電環境之WLAN雙頻天線模組，其尺寸為20×5.8×5.8 mm3，低頻由四分之一波長單端開路的槽孔天線結構提供，高頻藉由電感連接金屬片提供，由兩者達成涵蓋WLAN 2.4 GHz (2.4 ~ 2.5 GHz) 與WLAN 5 GHz (5.15-5.85 GHz) 頻段。經由實作與量測，驗證此設計有良好的匹配與不錯的輻射效率。
論文第二部分為應用於筆電大槽孔環境之雙天線解耦合設計，延續本團隊先前研究的雙天線解耦合技術，應用筆電螢幕、轉軸與基座之間形成的雙端短路大槽孔，將天線平行擺放至筆電基座，透過特定的大槽孔長度，可將雙天線之間的傳導電流抵消，降低雙天線之間的耦合量，使天線能提升輻射效率。
論文第三部分為應用於金屬筆電環境之WLAN雙頻共振腔天線，使用筆電金屬機殼與內部金屬結構，以形成半開口的共振腔天線，低頻藉由共振腔的整體尺寸來提供基頻模態，高頻則由共振腔的高階模態組成，最後新增金屬脊片與微調激發源結構，達成WLAN雙頻操作效能。
論文第四部分為利用雙天線同時輻射的方式以達成降低SAR值之效果。藉由改變雙天線之間的相位與間距，變動電磁場的近場分布，使其強度降低，讓SAR值可以符合輻射安全法規標準。以上提出的架構經由實作與量測驗證，皆符合實際筆電產品應用的需求。

Mobile device, such as laptops, are designed with narrow bezels and metal enclosures, which greatly reduces the space available for antennas and hence makes antenna design very challenging.
The first part of this thesis is a WLAN dual-band antenna module applicable to the laptop environment. Its sizes are 20×5.8×5.8 mm3. The low band resonance is provided by the quarter-wavelength single-ended open slot, and the high band resonance is provided by an inductor-connected metal sheet. This antenna can provide dual WLAN band operations. The fabricated prototype shows good matching and radiation efficiency.
The second part is a dual-antenna decoupling design applicable to the laptop hinge environment. By placing the antennas parallel to the laptop base with a proper spacing the conduction current between the two antennas can be cancelled. This measure reduces the amount of coupling between the two antennas and effectively improves the radiation efficiency.
The third part is a WLAN dual-band resonant cavity antenna applicable to the metal laptop environment. The laptop metal case and internal metal structure are used to form a partially opened resonant cavity. The low band resonance is determined by the overall sizes of the resonant cavity. The high band resonance is formed with the high order modes of the resonant cavity. This antenna can meet the dual band operation need of WLAN.
The fourth part is to use a two antenna scheme to achieve low SAR values. By changing the phases and the spacing between the two antennas, the antenna region field distribution is suppressed. The SAR value is hence reduced to meet the safety standards. The proposed antenna configuration is verified by measurement result, and satisfy the actual product needs.

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